The following WORKED for me:
After contacting Steinberg customer service (they were very helpful) I was advised to de-install the usually recommended driver version 2.0.3 and try installing the older version: https://download.steinberg.net/downloads_hardware/Yamaha_Steinberg_USB_Driver/Mac/2.0.2/YSUSB_V202_Mac.zip?_ga=2.23082874.193255019.1586178438-157914980.1567515908
Now my MAC recognizes the installed software driver.